Rotaky steam-engine



J. B. ROOT.

A Steam Engine. t No. 18,989. Patented Dec. 29, 1857'.

'N x ik --it I R 4% I1| l I l UNITED STATES PATENT OFFICE.

JOHN B. ROOT, OF YOUNGSTOWN, NEW YORK.

ROTARY STEAM-ENGINE.

Specification of Letters Patent No. 18,989, dated December 29, 1857.

To all whom it may concern.

Be it known that I, JOHN B. Boor, of the village of Youngstown, in thecounty of Niagara and State of New York, have invented a new andImproved Rotary Steam Engine; and I do hereby declare that the followingis a full description thereof, reference being had to the accompanyingdrawings, and the letters'of reference marked thereon, making part ofthis specification, in which- Figure l is an end view of the engineshowing the parts which are outside of the cylinder in their places.Fig. 2 is an end view with the head It and the parts outside of itremoved showing the internal parts of the engine. Fig. 3 is alongitudinal section.

Like letters represent like parts in all of the figures.

O is the cylinder with the valve chamber, c, and the abutment chamber D,attached to it.

7a, and h are the heads of the cylinder which are bolted on to each endof it. In the center of each head and concentric with t-he bore of thecylinder are hubs which are bored and fitted with the circular boxes 0and 0 through which the shaft L passes as seen in Fig. 3. the headsextended out on one side so as to cover the ends of the abutment chamberD as seen in Fig. l.

L is the shaft from which the power of the engine is taken; it passesthrough the center of the cylinder and has its bearings in the boxes 0and 0 in the center of the heads 7L and 7L. On one end of the shaft iskeyed the crank and t-he eccentric Gr; the crank is made and set on theshaft so that the wrist or pin w is on an exact line with the center ofthe piston.

P is the piston which is keyed fast on the shaft. It is cylindrical inform. The shaft passes through it eccentrically or near one side, theopposite side touching the inner surface of the cylinder and rubsagainst it, being made steam tight by the packing plate a. The ends ofthe piston fit tight against the heads of the cylinder z` and it and rubagainst them being made steam tight by the packing rings marked n Figs.2 and 3.

A is the abutment; itoscillates on its axis m as the piston movesaround. The end of it is fitted with a gib g which rubs against thepiston and is itted into the end of the abutment with a hinge joint sothat it may regulate itself to the position of the piston and alwayshave a good bearing upon it. The upper part of the abutment extends thewhole length of the cylinder and rubs against the heads at each end. Itis made steam tight against the heads by the packing plates a (F ig. 2)which are let into each side of the upper part of the abutment. Theupper surface of the abutment rubs against the packing plate e (Fig. 2)which is lit-ted into a groove in the metal of the cylinder. This makesa steam tight joint between the top of the abutment and the cylinder.The upright part of the abutment which connects the upper part with theaxis m is narrower than the upper part leaving a space on each sidebetween it and the heads which allows the exhaust steam to pass it. Theaxis of the abutment m extends through the head L and has the lever ykeyed on the end of it. This lever is made and keyed on so that the ping in the end of it will be exactly opposite to the center of the hingeof the gib, in the end of the abutment. `The connecting rod f connectsthe pin g with the crank pin or wrist 'w and is of the same length asthe distance from the center of the piston to the'center of the gibhinge g. Therefore it will be seen that the crank a" will govern themotion of the abutment and always keep the end of the abutment at g incontact with the piston. The eccentric Gr works the valve fu by means ofthe rod g which acts upon the lever N which is attached to the valve.The valve o acts over the port 2J and regulates the induction andcutting oft' of the steam. The eccentric is set upon the shaft and thelength of the valve rod regulated so that the valve will always open theport p as soon as the piston has passed the steam port 79 and closeagain at the point in the revolution at which it is set to cut olf, itcan be made to cut off at i any point of the revolution by regulatingthe eccentric and rod for that purpose.

The manner in which the steam acts to give motion to the engine is asfollows. The steam is admitted into the valve chamber c through thesteam pipe s and when the valve o is opened passes from there into thecylinder through the port p and passes upon the piston P forcing itaround in the direction of the arrows until it passes the opening Z)under the abutment when the steam exhausts through the opening b intothe abutment chamber D and from there passes oli through the exhaustpipe E. Vhile the piston is passing the abutment7 that is from the timethe steam exhausts until the piston passes the port p and again receivessteam, there is no force exerted, Which makes a dead point. This isovercome by the balance Wheel B Which carries the piston on past theport p When it receives the pressure of the steam again as before andthe motion of the engine is continued.

